Sears Craftsman 917.257720 - Manual (Page 20)

SERVICE AND ADJUSTMENTS
FRONT-TO-BACK ADJUSTMENT (See Figs. 24 and 25) -
IMPORTANT: DECK MUST BE LEVEL SIDE-TO-SIDE. IF
THE FOLLOWING FRONT-TO-BACK ADJUSTMENT IS
NECESSARY, BE SURE TO ADJUST BOTH FRONT LINKS
EQUALLY SO MOWER WILL STAY LEVEL SIDE-TO-SIDE.
To obtain the best cutting results, the mower housing
should be adjusted so the front is approximately 1/8" to 1 /2"
lower than the rear when the mower is in its highest
position.
Check adjustment on right side of tractor. Measure dis­
tance “F” directly in front of and behind the mandrel at
bottom edge of mower housing as shown.
• Before making any necessary adjustments, check that
both front links are equal in length.
• If links are not equal in length, adjust one link to same
length as other link.
• Tolowerfront of mower housing, loosen nut “G” on both
front links an equal number of turns.
• When distance “F” is 1/8" to 1/2" lower at front than
rear, tighten nut “H” againsttrunnion on both front links.
• To raise front of mower housing, loosen nut “H” from
trunnion on both front links. Tighten nut “G” on both
front links an equal number of turns.
• When distance “F” is 1/8" to 1/2" lower at front than
rear, tighten nut “H” against trunnion on both front
links.
NOTE: Each full turn of nut “G” will change dim. “F” by
approximately 3/8".
• Recheck side-to-side adjustment.
FIG. 24
BOTH FRONT LINKS SHOULD BE EQUAL IN LENGTH
TO REPLACE MOWER DRIVE BELT
MOWER DRIVE BELT REMOVAL (See Fig. 26) -
•
Park tractor on a level surface. Engage parking brake.
• Remove four screws from L.H. mandrel cover and
remove cover.
• Roll belt over the top of L.H. mandrel pulley.
• Remove belt from electric clutch pulley.
• Remove belt from idler pulleys.
• Remove any dirt or grass clippings which may have
accumulated around mandrels and entire upper deck
surface.
• Check primary idler arm and two idlers to see that they
rotate freely.
• Be sure spring is securely hooked to primary idler arm
and bolt in mower housing.
MOWER DRIVE BELT INSTALLATION (See Fig. 26) -
• Install belt in both idlers. Make sure belt is in both belt
keepers at the idlers as shown.
• Install new belt onto electric clutch pulley.
• Roll belt into upper groove of L.H. mandrel pulley.
• Carefully check belt routing making sure belt is in the
grooves correctly and inside belt keepers.
• Reassemble L.H. mandrel cover.